What development tool can I use to program in iPad for iPad and iPhone?

I want program or code using my iPad for iPad. What development tool can I use?

Added (1). I need a tool for iPad so I can code in iPad. It seems the tools suggested require MAC.
I want to code using my iPad and not in PC or MAC

Objective C I believe is the language IOS uses, so if you want to program for ipads/phones learn that first. If you want to program for IOS you have to sign up as a developer for apple. They provide you with all the tools, but it does cost money.

You can use 'Xcode IDE'. You can find more tool from https://developer.apple.com/...apple.com/technologies/tools/" class='ext_link'>https://developer.apple.com/...ies/tools/

also you might wanna take a look at https://developer.apple.com/

And if you are not a programmer, you can get it developed from developer.

Not sure about the free tool. If you wanted to develop an application, you can try Intalio Create.